// JavaScript Document
jQuery.extend({
	handleError: function( s, xhr, status, e ) 	{
		if (s.error) {			
			s.error.call( s.context || s, xhr, status, e );		
		}
		if (s.global) {			
			(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );		
		}
	},
    createUploadIframe: function(id, uri) {
    	//create frame
        var frameId = 'jUploadFrame' + id;
        
        if(window.ActiveXObject) {
        	var io ;
        	if(navigator.appVersion.indexOf('MSIE 6.0') > 0 || navigator.appVersion.indexOf('MSIE 7.0') > 0|| navigator.appVersion.indexOf('MSIE 8.0') > 0)
        	{
        		io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
        	}else{
        		io=document.createElement("iframe");
                io.id=frameId;
                io.name=frameId;
        	} 
            if(typeof uri== 'boolean'){
                io.src = 'javascript:false';
            } else if(typeof uri== 'string'){
                io.src = uri;
            }
        } else {
            var io = document.createElement('iframe');
            io.id = frameId;
            io.name = frameId;
        }
        io.style.position = 'absolute';
        io.style.top = '-1000px';
        io.style.left = '-1000px';

        document.body.appendChild(io);

        return io;   
    },
    createUploadForm: function(id, fileElementId, data) {
        //create form	
      	var formId = 'jUploadForm' + id;
      	var fileId = 'jUploadFile' + id;
      	var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
      	if (data) {
	        for ( var i in data) {
	          jQuery(
	              '<input type="hidden" name="' + i + '" value="'
	                  + data[i] + '" />').appendTo(form);
	        }
      	}
      	for (var i = 0; i < fileElementId.length; i ++) {
	        var oldElement = jQuery('#' + fileElementId[i]);
	        var newElement = jQuery(oldElement).clone();
	        jQuery(oldElement).attr('id', fileElementId[i]);
	        jQuery(oldElement).attr('name', fileElementId[i]);
	        jQuery(oldElement).before(newElement);
	        jQuery(oldElement).appendTo(form);
      	}
      	//set attributes
      	jQuery(form).css('position', 'absolute');
      	jQuery(form).css('top', '-1200px');
      	jQuery(form).css('left', '-1200px');
      	jQuery(form).appendTo('body');
      	return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = "myupload";//s.fileElementId;        
	    var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
	    var io = jQuery.createUploadIframe(id, s.secureuri);
	    var frameId = 'jUploadFrame' + id;
	    var formId = 'jUploadForm' + id;  
        
        if( s.global && ! jQuery.active++ ) {
		   // Watch for a new set of requests
		   jQuery.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        // Create the request object
        var xml = {};   
        if( s.global ) {
        	jQuery.event.trigger("ajaxSend", [xml, s]);
        }            
        
        var uploadCallback = function(isTimeout) {  
		    // Wait for a response to come back 
		    var io = document.getElementById(frameId);
	        try {    
			    if(io.contentWindow) {
			      xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
			                  xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
			    } else if(io.contentDocument) {
			      xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
			                 xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
			    }      
	        } catch(e) {
	        	  jQuery.handleError(s, xml, null, e);
		    }
	        
	        if( xml || isTimeout == "timeout") {    
		        requestDone = true;
		        var status;
		        try {
		            status = isTimeout != "timeout" ? "success" : "error";
		            // Make sure that the request was successful or notmodified
		            if( status != "error" ) {
			            // process the data (runs the xml through httpData regardless of callback)
			            var data = jQuery.uploadHttpData( xml, s.dataType );                        
			            if( s.success ) {
			            	// ifa local callback was specified, fire it and pass it the data
			                 s.success( data, status );
			            };                 
			            if( s.global ) {
					        // Fire the global callback
				             jQuery.event.trigger( "ajaxSuccess", [xml, s] );
				        }                       
		            } else {
		             jQuery.handleError(s, xml, status);
		            }
		        } catch(e) {
		            status = "error";
		            jQuery.handleError(s, xml, status, e);
		        }            
		        if( s.global ) {
		        	// The request was completed
		             jQuery.event.trigger( "ajaxComplete", [xml, s] );
		        }
			
		        // Handle the global AJAX counter
		        if(s.global && ! --jQuery.active) {
		        	jQuery.event.trigger("ajaxStop");
		        }
		        if(s.complete) {
		        	s.complete(xml, status);
		        }               
		
		        jQuery(io).unbind();
			
		        setTimeout(function() { 
		        	try {
				       jQuery(io).remove();
				       jQuery(form).remove(); 
		            } catch(e) {
			           jQuery.handleError(s, xml, null, e);
			        }
		        }, 100);
			
		        xml = null;
			
	        }
        }
        // Timeout checker
        if( s.timeout > 0 ) {
            setTimeout(function(){
                if( !requestDone ) {
	        		// Check to see ifthe request is still happening
	                 uploadCallback( "timeout" );
                }
            }, s.timeout);
        }
        try {
		   var form = jQuery('#' + formId);
		   jQuery(form).attr('action', s.url);
		   jQuery(form).attr('method', 'POST');
		   jQuery(form).attr('target', frameId);
           if(form.encoding) {
                form.encoding = 'multipart/form-data';    
           } else {    
                form.enctype = 'multipart/form-data';
           }   
           jQuery(form).submit();
        } catch(e) {   
            jQuery.handleError(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }   
        return {abort: function () {}}; 
    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // ifthe type is "script", eval it in global context
        if( type == "script" ) {
        	jQuery.globalEval( data );
        }
            
        // Get the JavaScript object, ifJSON is used.
        if( type == "json" ) {
        	//data = jQuery.parseJSON(jQuery(data).text());
        	eval("data = \" "+data+" \" ");
        }
            
        // evaluate scripts within html
        if( type == "html" ) {
        	jQuery("<div>").html(data).evalScripts();
        }
            
        return data;
    }
});
